# A049221 (b-file synthesized from sequence entry) 1 1 2 0 3 1 4 4 5 14 6 46 7 148 8 474 9 1518 10 4864 11 15590 12 49974 13 160196 14 513522 15 1646134 16 5276800 17 16915150 18 54222686 19 173814580 20 557174698 21 1786062174 22 5725346304 23 18352995094 24 58831800038 25 188589419748 26 604536478850 27 1937883656166